//
//  ImagePlugin.swift
//  DLSDK
//
//  Created by osell on 2023/4/14.
//

import UIKit
import Kingfisher
import CoreMedia

public protocol ImageSource {
    /// 图片资源URL
    var imageURL: URL? { get }
    /// 图片资源字符串
    var imageStr: String? { get }
}

extension ImageSource {
    var imageURL: URL? { nil }
    
    var imageStr: String? { nil }
}

extension String: ImageSource {
    public var imageURL: URL? { URL(string: self.urlEncodingWithQueryAllowedCharacters) }
    
    public var imageStr: String? { self }
    
}

extension URL: ImageSource {
    public var imageURL: URL? { self }
    
    public var imageStr: String? { self.absoluteString.urlDecoded }
}


// MARK: - UIImageView
extension DLWrapper where Base: UIImageView {
    
    /// 设置图片
    /// - Parameters:
    ///   - url: 图片链接/名称, URL or String
    ///   - placeholder: 可选，默认nil
    ///   - completionHandler: 可选，默认为nil
    @MainActor public func setImage(with url: ImageSource?,
                         placeholder: UIImage? = nil,
                         completionHandler: ((UIImage?, Error?) -> Void)? = nil) {
        
        guard let imageURL = url?.imageURL else {
            let imageStr = url?.imageStr ?? ""
            // 如果是本地图片,加载本地图片
            if let image = UIImage(named: imageStr) {
                base.image = image
                return
            }
            // 如果是SDK中图片，则加载SDK中图片
            if let image = UIImage(named: imageStr) {
                base.image = image
                return
            }
            // 都不存在，则置为nil
            base.image = placeholder
            return
        }
        
        // 如果是视频, 获取视频第一帧
        if imageURL.imageStr?.contains(".mp4") == true {
            let source = AVAssetImageDataProvider(assetURL: imageURL, time: CMTimeMakeWithSeconds(0.0, preferredTimescale: 1))
            base.kf.setImage(with: source.convertToSource(), placeholder: placeholder) { result in
                switch result {
                case let .success(imageinfo):
                    completionHandler?(imageinfo.image, nil)
                case let .failure(error):
                    completionHandler?(nil, error)
                }
            }
        } else {
            // 使用kf加载图片
            base.kf.setImage(with: imageURL, placeholder: placeholder) { result in
                switch result {
                case let .success(imageinfo):
                    completionHandler?(imageinfo.image, nil)
                case let .failure(error):
                    completionHandler?(nil, error)
                }
            }
        }
        
    }
}

// MARK: - Button
extension DLWrapper where Base: UIButton {
    /// 设置按钮图片
    /// - Parameters:
    ///   - url: 图片链接, URL or String
    ///   - placeholder: 可选，默认nil
    ///   - completionHandler: 可选，默认为nil
    @MainActor public func setImage(with url: ImageSource?,
                         for state: UIControl.State,
                         placeholder: UIImage? = nil,
                         completionHandler: ((UIImage?, Error?) -> Void)? = nil) {
        
        guard let imageURL = url?.imageURL else {
            let imageStr = url?.imageStr ?? ""
            // 如果是本地图片,加载本地图片
            if let image = UIImage(named: imageStr) {
                base.setImage(image, for: state)
                return
            }
            // 如果是SDK中图片，则加载SDK中图片
            if let image = UIImage(named: imageStr) {
                base.setImage(image, for: state)
                return
            }
            // 都不存在，则置为nil
            base.setImage(placeholder, for: state)
            return
        }
        // 使用kf加载图片
        base.kf.setImage(with: imageURL, for: state, placeholder: placeholder, completionHandler: { result in
            switch result {
            case let .success(imageinfo):
                completionHandler?(imageinfo.image, nil)
            case let .failure(error):
                completionHandler?(nil, error)
            }
        })
    }
    
    /// 设置按钮背景图片
    /// - Parameters:
    ///   - url: 图片链接, URL or String
    ///   - placeholder: 可选，默认nil
    ///   - completionHandler: 可选，默认为nil
    @MainActor public func setBackgroundImage(with url: ImageSource?,
                                   for state: UIControl.State,
                                   placeholder: UIImage? = nil,
                                   completionHandler: ((UIImage?, Error?) -> Void)? = nil) {
        
        guard let imageURL = url?.imageURL else {
            let imageStr = url?.imageStr ?? ""
            // 如果是本地图片,加载本地图片
            if let image = UIImage(named: imageStr) {
                base.setBackgroundImage(image, for: state)
                return
            }
            // 如果是SDK中图片，则加载SDK中图片
            if let image = UIImage(named: imageStr) {
                base.setBackgroundImage(image, for: state)
                return
            }
            // 都不存在，则置为nil
            base.setBackgroundImage(placeholder, for: state)
            return
        }
        // 使用kf加载图片
        base.kf.setBackgroundImage(with: imageURL, for: state, placeholder: placeholder, completionHandler: { result in
            switch result {
            case let .success(imageinfo):
                completionHandler?(imageinfo.image, nil)
            case let .failure(error):
                completionHandler?(nil, error)
            }
        })
    }
}